FLUIDIC FLOW METER Russian patent published in 2024 - IPC G01F1/48 

FIELD: measurement.

SUBSTANCE: invention relates to measuring devices and can be used to measure gas or liquid flow rates in production processes, in automatic control systems, for example, gas turbine engine, also in energy resources metering units (for commercial metering). Proposed fluidic flow meter (FFM) comprises a primary frequency squirter probe (PFSP1), made in the form of a fluidic switch (FS1), closed by negative feedbacks, PFSP1 inlet is connected to FFM inlet cavity. Output channels of FS1 are connected to a baroelectric transducer converting pressure pulsations into an output electrical signal, the frequency of which is proportional to the volumetric flow rate. An operated valve (OV1) is installed in parallel to PFSP1, an additional PFSP2 is installed in series with PFSP1, the input of PFSP2 is connected to the output of PFSP1, and the outlet with the outlet cavity FFM, and parallel to the PFSP2, the constrictor CS2 is installed. Passage area of OV1 changes under action of differential baromechanical converter (BMC1), control cavities of which are connected to the cavities at the inlet and outlet of the FFM, so that the pressure difference arising during operation at the FFM at a certain first pressure difference begins to open OV1, opening it completely at the second certain pressure difference. At closed OV1, flow rate through FFM is judged by oscillation frequency FS1 PFSP1 (flow rate is proportional to frequency). After the beginning of OV1 opening, the flow rate is determined from the frequency of PFSP2 oscillations. Installation of additional OV2 in parallel to PFSP2 allows at high flow rates determining flow rate by signal PFSP1 (after the beginning of OV2 opening).

EFFECT: creation of relatively simple flow sensor with limited (small) working pressure difference, without sharp changes of pressure difference during its operation.

1 cl, 2 dwg